Deep Sky Object in Summer
Hoag's Object (Peculiar Galaxy in Serpens)
|Date & Time: ||Apr 28 2017, from 26:33 to 27:06 JST(+0900)
|Composed 10 shots with 3 minutes exposed|
|Optical: ||Meade 25cm(10") Schmidt-Cassegrain with conversion lens (f=1600mm, F6.3)
|Auto-guided with Meade LX200 Equatorial & Pictor 201XT
|Digital Camera: ||Nikon D810A
|Location: ||Ooizumi, Hokuto city, Yamanashi pref.
|Camera Settings: ||Recording Format...14bit CCD-RAW, converted to 16bit TIFF(4080×4080)|
|Sensitivity...ISO6400, White Balance...Daylight|
It's a deep sky object positioned in northern edge of Serpens Caput.
You can find out about 6.5 degrees southwest from alpha Coronae Borealis, Alphecca.
This picture has captured a small central bulge and very dimmed outer ring-like structure.
The Hubble Space Telescope (HST) has taken the object with its ring clearly.
|Hoag's Object / Galaxy|
|R.A.||15h 17m 13.7s (2000.0)|
|Dec.||+21° 35' 03" (2000.0)|
|Apparent Size||about 2.0'|
|Distance||600 million light yrs.|
|Group of Galaxies||-|
|Other IDs||PGC 54559|
The object has a nickname of gThe Hoag's Objecth from name of discoverer, Art Hoag.
The galaxy has a central nucleus including older stars and an outer ring formed from only young stars.
And we don't know reason why there is a void region between two structures like a stellar generation gap since discovered year 1950.
The galaxy has a diameter of about 100 thousand light years and a distance of 600 millions light years.
||Hoag's Object captured by HST